A method for automatic scaling of F1 critical frequencies from ionograms
Article first published online: 22 MAR 2008
Copyright 2008 by the American Geophysical Union.
Volume 43, Issue 2, April 2008
How to Cite
2008), A method for automatic scaling of F1 critical frequencies from ionograms, Radio Sci., 43, RS2S91, doi:10.1029/2007RS003723., and (
- Issue published online: 22 MAR 2008
- Article first published online: 22 MAR 2008
- Manuscript Accepted: 11 OCT 2007
- Manuscript Revised: 3 OCT 2007
- Manuscript Received: 4 JUL 2007
- F1 layer
 This work describes a method that has been developed to automatically assess whether the F1 layer is present or not on an ionogram trace, and, if present, to scale the F1 critical frequency foF1. The ionograms in which the information related to the F1 trace is insufficient are identified and considered separately. In order to test the performance of this method and the conditions in relation to which it could be improved, a data set of ionograms recorded from September 2005 to June 2006 by the AIS-INGV ionosonde installed at Rome was used. The values obtained automatically by Autoscala, with the addition of this new F1 layer routine, were compared with those obtained by the standard manual method.